Our buffer interface named IFace can be used to add an SDR panadapter to the Icom IC-9100 transceiver.
The operations to be performed are very simple, it is sufficient to obtain from its wiring diagram the information on the points where to take the IF signals. This radio, in fact, uses different mixers depending on the selected band. In particular, we will have one for HF and 50 MHz, one for VHF and one for UHF (plus a fourth for the optional 1.2 GHz band). The following image shows the block diagram of the radio.
Below is a portion of the HF / 50 MHz reception chain and the list of the various intermediate frequencies: we are interested in the first one so as to have sufficient bandwidth for the panadapter. In HF/50 MHz we will tune our SDR receiver to 64.455 MHz, while in VHF to 10.850 MHz while in UHF to 71.250 MHz.
We now proceed to identify the exact points on the circuit diagram where to take the IF signal to be sent to the IFace. The following images show the sampling points of the signal for the HF and 50 MHz bands and of the power supply for the buffer interface.
Now let’s analyze the circuit diagram for VHF and UHF. It is easy to identify the two mixers and the relative points where to connect the IFace input.
The sampling points for the IF signal for the VHF and UHF bands are shown below. It is therefore clear that this radio requires 3 IFace buffer interfaces in order to cover all the available bands.
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ATTENTION: Though installing the IFace is not difficult, you do this at your own risk. TSP S.r.l. is not responsible for any damage, unwanted side-effects or whatever.
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